I'm on a regime of one a day vitamins (Magnesium, Calcium, Iron, Sea Kelp, Garlic Tabs, Vitamin A, Vitamin C, Selenium and some herbs which I take, pretty much because I always have since I was a kid.

a) I was wondering, instead of taking all these tabs individually, can I take them all at the same time without compromising the potency of any individual supplement?

b) I've been told that instead of taking the supplements individually, I can use an electronic pestle & morter to crush them all together and create a blended capsules with all the vitamins. It may mean taking two or three capsules (to get the exact portion of '1 a day' for each of the tabs), but I can take them every 8 or 12 hours.